3girls absurdres backlighting benevole black_hair black_skirt black_thighhighs brown_footwear brown_hair chair classroom closed_eyes commentary_request curtains desk girl_sandwich highres holding_another's_wrist imminent_kiss indoors long_hair medium_hair midriff_peek multiple_girls open_mouth original polyamory sandwiched school_chair school_desk school_uniform shirt shoes skirt standing sunlight thighhighs white_shirt window yuri zettai_ryouiki